ES2651452T3 - Ophthalmic surgical cassette and system - Google Patents

Abstract

A cassette 74 for use with an ophthalmic surgical pump 16 for collecting aspirant fluid and tissue from a patient's eye includes a rigid walled container 18 having an interior volume 42. At least one tapered alignment slot 20 is formed in a side wall of the container 18 and extends from a back wall 24 towards a front wall 26. An irrigation and aspiration manifold base 50 is removeably attached to the container 18. An aspiration path 46 is formed within the container 18 for receiving the aspiration fluid and the tissue from the eye and directing the flow of fluid towards a front half of the container 18 before the fluid and tissue collects within a majority of the interior volume 42 of the container 18. A fluid level indicator 34 is formed on a wall 22 of the container 18, such that an associated photo-detector 86 of the pump 16 may determine a level of fluid in the container 18.

Description

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DESCRIPTION

Ophthalmic surgical cassette and system Background of the invention

1. Field of the invention

The present invention relates to an ophthalmic surgical cassette and pump system. More specifically, the present application refers to a venturi ophthalmic surgical cassette and pump.

Description of the related technique

Ophthalmic surgical cassettes for use with various pump systems, including venturi pumps, are known in the art. Such surgical cassettes, particularly for use with the venturi pump, typically include a rigid wall cassette that may be connected to an irrigation / aspiration tube. In turn, the tube is typically attached to a surgical handpiece for use by a surgeon during eye surgery. The nested wall cassettes then have most of an inner volume of a cassette or reservoir that collects the flow of aspiration fluid and tissue from a surgical site for later disposal. Such cassettes can be disposable or reusable. Such nested wall cassettes are typically maintained within a pump assembly and, therefore, it is especially important that such cassettes have a fluid level detection scheme to prevent the cassette from overflowing and surgical fluids escaping into the interior of the pump. bomb and create a biological hazard, besides possibly damaging the bomb.

Fluid level detection schemes are known, such as that of US Patent 4,773,897, where a floating ball is used within a defined chamber of the cassette. The floating ball then floats with increasing levels of fluid inside the cassette and eventually blocks the path between a light source and a phototransistor, which combine to form a fluid level detector. Once the floating ball blocks the light path to the photodetector, the system then moves the pump to a stop and the aspiration ceases until the cassette has emptied. Although such floating ball schemes have been used for years and are reliable, over time the floating balls become somewhat saturated with water and the exact amount of floating of a ball can vary from one ball to another during manufacturing. Therefore, the exact level of fluids within a cassette is not systematically determined by said floating ball and light detector scheme.

US 6,511,454 B1 refers to an irrigation / aspiration apparatus for supplying an irrigation fluid from an irrigation source to a surgical area by surgical instruments to remove the irrigation fluid with a residual tissue by aspiration.

It is common in pump cassettes to include a suction and irrigation tube attached to the cassette. This tube must be typically removed from the burrs of the cassette coupling when the cassette is to be emptied. Removing the burr tube can be difficult and slow and is not easily carried out. Therefore, it will be desirable to have a collection cassette, where most of the tube does not have to be removed from its connections. This speeds up the surgery, and makes the timely preparation of the cassette for additional surgery much more enjoyable for the operating room staff.

Surgical cassettes of the prior art typically vader the fluid from the aspiration tube to the cassette in a position toward the rear of the cassette and away from the operator. During surgery, a surgical console typically has sensors and indicator icons and audible alerts for when it is assumed that the aspiration flow has ceased, while still vados is applied to the aspiration tubes. Such schemes are generally sufficient to allow the safe operation of the surgical cassette. However, it would be desirable for the operator to easily see the fluid flowing to the inner volume of the cassette reservoir to provide an easy and convenient visual feedback to the operator that there is aspiration fluid flow.

Typical prior art cassettes are essentially a three-dimensional rectangle. It is desirable to provide some sort of alignment or insertion grains to help the operator properly insert the cassette into its respective pump.

WO 93/17729 refers to a system for controlling fluid in a microsurgical handpiece containing a control console, a cassette having a body with an open channel formed integrally in the upper part and a tight seal adhered to the upper part for seal the fluid-tight channel and forming a small deposit. A receptacle that forms a large deposit is mounted on the body.

US 4,493,695 refers to a microsurgery system including an instrument that includes a ford source and control means, a remote-connected handpiece adapted to be disposed near the site of the surgery and including an inlet and conduit means of aspiration coupled to the entrance and the source of ford to move material away from the surgery site.

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Therefore, an improved ophthalmic surgical system and cassette is needed.

The invention is defined in claim 1.

Brief description of the drawings

Figure 1 is a perspective view of an ophthalmic surgical system.

Figure 2 is a perspective view of a portion of an ophthalmic surgical cassette according to the present invention.

Figure 3 is a partial cut away view of Figure 2.

Figure 4 is a perspective view of the opposite side of Figure 3.

Figure 5 is an elevation view of Figure 4.

Figure 6 is a perspective view of a portion of an ophthalmic surgical cassette according to the present invention.

Figure 7 is a perspective view of an ophthalmic surgical cassette according to the present invention.

Figure 8 is a top view of an alternative embodiment of Figure 6.

Figure 9 is a partial cross-sectional view of a portion of the cassette of Figure 2.

Figure 10 is a graphic illustration of a detection.

Figure 11 is an alternative embodiment of a fluid level indicator.

Figure 12 is a graphic illustration of a fluid level detection of Figure 11.

And Figure 13 is a cassette detection for use with a photodetector.

Detailed description of the preferred embodiment

Figure 1 depicts a perspective view of an ophthalmic surgical console 10. Console 10 includes a body or chassis 12, a screen 14, and a pump 16. Console 10 may also include a set of IV stick, other ophthalmic surgical modules. , such as a light module, a scissors module, a second pump, and other typical ophthalmic surgical modules, of which not all are represented. A nested wall tank 18, with an inner volume described in detail below, forms a part of a cassette for use with an ophthalmic surgery pump, such as pump 16, and is typically inserted into pump 16. The tank is preferably a transparent plastic material suitable for ophthalmic surgery, as is well known in the art. The reservoir or cassette 18 preferably includes at least one tapered alignment groove 20 formed in a side wall 22 of the reservoir 18. The groove preferably extends from a rear wall 24 to a front wall 26. An irrigation manifold base (described in detail below), it is preferably mounted removably in the reservoir 18 and is maintained in the reservoir 18 with a tongue 28 and grooves 30. An aspiration path is preferably formed within the reservoir 18 to receive aspiration fluid and eye tissue a through inlet 32. The suction path (described in detail below) preferably directs the flow of fluid to a front half of the reservoir before the fluid and tissue are collected within most of the inner volume of the reservoir 18 A fluid level indicator 34 is preferably formed in the wall 22 of the reservoir 18, such that an associated photodetector of the pump (described in detail below) you can determine a fluid level in the reservoir 18.

The reservoir 18 includes an upper wall 36 having a first portion to receive the suction and irrigation manifold base, a second portion having a structure 32 for connection to a suction tube of the manifold, and a structure 38 for connection to a venturi pump The structure 38 is typically an orifice over which a gas is blown in order to create a venturi aspiration within the reservoir 18.

The tapered groove 20 is preferably one of a pair of tapered alignment grooves formed on the opposite side walls of the reservoir 18. The grooves preferably have a generally flared U-shape. These slots 20 help the user to insert the reservoir 18 into the pump 16 and ensure proper alignment of the reservoir 18 within the pump 16. Figure 3 depicts a cut perspective view of the reservoir 18 that includes a side wall 40 on the side opposite of the side wall 22. Figure 3 also represents the additional preferred alignment slot 20 that is not shown in Figure 2.

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Figure 4 represents a perspective cut view of the opposite side of the view represented in Figure 3. Figure 4 represents half of most of the interior volume of the reservoir 18 on the arrow 42. As can be seen, the reservoir 18 Typically it includes a plurality of nested support elements 44 spaced throughout the reservoir 18. These nested supports 44 prevent the side walls 22 and 40 from being crushed when vacm is created within the interior volume 42 of the reservoir 18. An aspiration path is represented generally at 46, and the aspiration fluid and tissue flow in the direction of the arrows 48 within the reservoir 18 to receive aspiration fluid and tissue from an eye through the inlet 32. The aspiration path 46 directs a flow of fluid towards a front half and preferably from a rear portion of the reservoir 18 a next to the front wall 26 of the reservoir 18. The suction path 46, directing the fluid flow has With the front wall 26, it allows the operator to easily see if aspiration fluid and tissue is flowing to the inner volume 42 of the reservoir 18 during surgery. This is especially advantageous because it provides direct visual feedback to the operator that tissue aspiration is functioning properly during surgery. In this way, the suction path 46 directs the flow of fluid to a front half of the reservoir 18 before the fluid and tissue are collected within most of the inner volume 42 of the reservoir 18.

Figure 5 is an elevational plan view of the perspective of Figure 4, and more clearly depicts the suction path 46 in the direction of fluid flow in the arrows 48.

Figure 6 represents a perspective view of a preferred embodiment of an irrigation and suction manifold base 50. The collector base 50 includes tabs 52 that engage with grooves 30, shown in Figure 2, and the base 50 also fits preferably between the tongue 28 and the upper surface 36, such that the collector base 50 is fixedly held in the reservoir 18. The collector base 50 and the reservoir 18 are combined to form an ophthalmic surgical cassette, according to the present invention. . The collector base 50 preferably includes an irrigation inlet tube 54 to receive irrigation flow from an irrigation source, as is known in the art. The collector base 50 also preferably includes an irrigation outlet tube 56 to allow the irrigation fluid to flow from the tube 54 to an ophthalmic surgical instrument for use during surgery. The collector base 50 also preferably includes an aspiration line 58 and an aspiration tube 60 for supplying aspiration fluid and tissue from a surgical site (not shown) to the reservoir 18. The aspiration tube 60 is connected to the inlet 32. The manifold base 50 also preferably includes a suction manifold 62 that connects the suction line 58 and the aspiration tube 60 with liquid and reflux ventilation tubes 64. Blocks 66 and 68 provide contact surfaces for conventional clamp valves to open and close the reflux and ventilation tubes 64 and the suction line 60 and are controlled by the pump 16 and the surgical console 10 in a conventional manner. An irrigation inlet tube 54 also preferably includes and cooperates with a clamp valve to activate and deactivate the flow of irrigation fluid. The irrigation manifold 70 connects the reflux tube 64 with the irrigation inlet tube 54 and the irrigation outlet tube 56. Figure 6 depicts the collector base 50 with an additional empty slot 72 that can be used for an embodiment alternative of the present invention, described in detail later in Figure 8.

The collector base 50 conveniently allows the irrigation inlet and outlet tubes 54 and 56 and the suction line 58 to remain connected to the collector base 50 as described above throughout the surgery. If the tank 18 is filled with fluid and tissue and has to be emptied, a simple pressure of the tabs 52 and a single disconnection of the tube 60 from the tank 18 allow the operator to empty the tank 18 and quickly reassemble the collector base 50 in the reservoir 18 together with the suction tube 60. In this way, the reservoir 18 can be emptied quickly and conveniently without the awkward and often difficult extraction of the tubes 54, 56, and 58 as required by the prior art.

Figure 7 is a perspective view of a cassette 74 according to the present invention that includes a reservoir 18 and a collector base 50, as described above. Cassette 74 is shown with the entire length of tubes 54, 56 and 58 together with a retention band 76 for inclusion within an ophthalmic surgical package.

Figure 8 represents a top view of an alternative embodiment of a collector base. The manifold base 78 is identical to the base 50 described above, with the exception that the manifold base 78 preferably includes a second suction line or tube 80. The tube 80 is connected to an alternative embodiment of a manifold 82, which It is similar to manifold 62 described above. Depending on the surgery performed, a surgeon may prefer a second suction line 80, as shown in Figure 8 so that a second surgical handpiece can be assembled without the need to remove the tubes from the surgical handpiece connected to the suction line 58. Figure 8 also conveniently represents preferred positions of the clamp valve as indicated by the "X" in bold in 84.

Figure 9 depicts a partial cross-sectional section of the reservoir 18 representing the fluid level indicator 34 in cooperation with an associated photodetector 86 of the pump 16. The fluid level indicator 34 is preferably formed in the wall 22 of the reservoir 18 such that the associated photodetector 86 of the pump 16 can determine a fluid level in the reservoir. The fluid level indicator 34 essentially operates as a prism to detect the level of fluid in the reservoir 18.

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The fluid level gauge 34 is a grooved section, as shown, having a face 88 essentially parallel to the wall 22 of the reservoir 18 and a pair of inclined side sections 90 and 92 connecting the face 88 to the wall 22 of the reservoir 18, such that a prism is formed so that the fluid level of the cassette 74 can be determined by the photodetector 86.

The photodetector 86 could be an appropriate imaging device and light source, such as charge coupling devices (CCD) or CMOS devices, or it could preferably be a contact image sensor. A contact image sensor is essentially a one-dimensional series of photodetectors used to create images. An example of a contact image sensor is the M106-A6-R1 model module that can be obtained from CMOS Sensors Inc. Such contact image sensors are relatively small in size and are advantageous for use in the present invention. Although as indicated above, other photodetectors can be used. Figure 10 represents a light transmission diagram through a fluid level indicator, such as 34 (the prism of Figure 10 is not represented on the same scale as Figure 9). The fluid level indicator 34 and the photodetector 86 cooperate to detect a fluid level through the physics of light transmission through a prism and between the limits of materials having different refractive indices. As those skilled in the art will appreciate, when the light intersects a boundary between two means at a right angle, almost all the light is transmitted across the boundary. However, when the light intersects a boundary between two means at an angle of less than 90 °, part of the light is transmitted and part of the light is reflected. The angle of the light and the change in the refractive index between the two means determines how much light is transmitted and how much light is reflected. This principle is applied to detect the fluid level in the cassette 74. The detection of the fluid level in the cassette 74 with a photodetector 86, such as a contact image sensor, includes two sets of limit conditions. A set of limit conditions is present below the fluid level and another set of limit conditions is above the fluid level. Both sets of limit conditions have two interfaces. One interface is between air and the cassette material and the other is between the cassette material and the contents of the cassette, that is, the aspiration fluid and the tissue or air. The first interface, between the air and the cassette material, is insignificant since the amount of reflected light will be the same regardless of the content of the cassette. The second interface, between the cassette material and the cassette content is of great importance, since the amount of reflected light is directly related to the cassette content. The various lines in Figure 10 show this difference in the reflected light.

Taking a step further the concept of reflected intensity described above, adapting the reflection and the transmission coefficients, a greater difference can be achieved between the intensity of the present fluid and the non-present fluid. This can be done by molding features on the cassette wall, as described above in connection with Figure 9. The amount of light received by the photodetector 86 is directly proportional to the amount of light reflected in the limits of the medium. By monitoring the amount of light received in each of the photodetectors, the fluid level can be determined. The fluid level corresponds to the point at which the intensity of the reflected light changes.

Figures 11 and 12 show an alternative embodiment of a fluid level indicator, according to the present invention. Figure 11 depicts a fluid level indicator 94 having a bulged area 96, such that the bulging area expands any fluid in the reservoir, thereby allowing the photodetector 100 to determine a fluid level of the cassette 101. fluid level indicator 94 cooperates with contrast color strips 98, such that the bulging area 96 amplifies the strips 98 where there is fluid and does not amplify the strips where there is no fluid, as shown in Figure 12. The photodetector 100 can then determine the point at which the amplified strip changes to a non-enlarged strip. The bulging area 96 is essentially a lens that takes advantage of the difference in refractive indices between air and fluid. In the embodiment of Figure 11, if the cassette were molded with the bulged area 96, it enlarges an image, such as the strips 98 located on the opposite side of the cassette. Figure 13 illustrates another embodiment. Figure 13 includes a partial elevation view of a side wall 102 of a cassette similar to that described above and also includes a fluid level indicator 104 similar to indicator 34, described above. The indicator 104 also includes a geometric figure 106 or other indices, which can be used to identify the type of cassette to be used in surgery. This identification may be convenient for the user of the system, because a subsequent cassette could be distinguished from a previous cassette and the appropriate surgical parameters could be presented to the surgeon. The index 106 is preferably placed inside the indicator 104 at a point where fluid level detection is not necessary. In addition, the following points are provided.

1. A cassette for use with an ophthalmic surgery pump to collect aspirating fluid and tissue from a patient's eye including:

a tank with a rigid wall that has an interior volume;

at least one tapered alignment groove formed in a side wall of the reservoir and extending from a rear wall to a front wall;

a suction and irrigation manifold base removably mounted in the tank;

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an aspiration path formed within the reservoir to receive the aspiration fluid and eye tissue and direct the fluid flow to a front half of the reservoir before the fluid and tissue is collected within most of the interior volume of the reservoir ; Y

a fluid level indicator formed in a tank wall, such that an associated photodetector of the pump can determine a fluid level in the tank.

2. The cassette of point 1, where the deposit is made of a transparent plastic material.

3. The cassette of point 1, where the tank includes an upper wall that has a first portion to receive the base of the irrigation and aspiration manifold and a second portion that has a structure for connection to a suction tube of the manifold and structure for connection to a venturi bomb.

4. The cassette of point 1, where the cassette has a pair of tapered alignment grooves formed on opposite side walls of the reservoir.

5. The cassette of point 4, where the grooves have a generally flared U-shape.

6. The cassette of point 1, where the collector base also includes an infusion inlet tube, an infusion outlet tube, a fluid vent tube, and a first suction tube.

7. The cassette of point 6, including a second suction tube.

8. The cassette of item 6, where the collector base also includes an irrigation manifold connected to the infusion inlet tube, the infusion outlet tube, and the fluid vent tube, and a suction manifold connected to the first suction tube and fluid ventilation tube.

9. The cassette of point 7, where the aspiration manifold is also connected to the second aspiration tube.

10. The cassette of point 1, where the aspiration path is formed from a rear portion of the tank to approach a front wall of the tank.

11. A cassette for use with an ophthalmic surgery pump to collect aspirating fluid and tissue from a patient's eye including:

a tank with a rigid wall that has an interior volume; Y

at least one tapered alignment groove formed in a side wall of the tank and extending from a rear wall to a front wall to simplify the introduction of the cassette into the pump.

12. The cassette of point 11, where the cassette has a pair of alignment grooves formed on opposite side walls of the reservoir.

13. The cassette of point 12, where the grooves have a generally flared U-shape.

Thus, a novel ophthalmic surgical cassette and system has been shown, the variations of which will be apparent to those skilled in the art. Such variations fall within the scope of the present invention and the claims set forth herein.

Claims (5)

5 10 fifteen twenty 25 1. A cassette for use with an ophthalmic surgery pump to collect aspirating fluid and tissue from a patient's eye including: a nigged wall tank (18) having an internal volume to collect the fluid and tissue aspirated; Y an irrigation and aspiration manifold base (50) mounted extrafbly in the tank (18) to be able to empty the cassette during surgery without disconnecting irrigation and aspiration tubes (54, 56, 60) from the collector base, where the tank includes an upper wall (36) that has a first portion to receive the base of the irrigation and aspiration manifold and a second portion that has a structure (32) for connection to a suction tube (60) of the manifold and a structure (38) for connection to a venturi pump (16). 2. The cassette of claim 1, wherein the manifold base further includes an infusion inlet tube (54), an infusion outlet tube (56), a fluid vent tube (64), and a first tube of aspiration (60). 3. The cassette of claim 2, further including a second suction tube (80). 4. The cassette of claim 2, wherein the collector base further includes an irrigation manifold (70) connected to the infusion inlet tube (54), to the infusion outlet tube (56), and to the ventilation tube of fluid (64), and a suction manifold (62) connected to the first suction tube (60) and the fluid vent tube (64). 5. The cassette of claim 3, wherein the aspiration manifold (62) is also connected to the second aspiration tube (80).